Derivative Commodity Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedges, Assets [Abstract]

Fair Values Of Derivative Instruments In Consolidated Balance Sheets

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Asset Derivatives
	Balance Sheet Location	Fair Value as of December 31,
		2015		2014
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	3,465	$	3,145
Commodity forward contracts	Deferred charges and    other assets, net	2,088		—
Total asset derivatives		$	5,553	$	3,145
	Liability Derivatives
	Balance Sheet Location	Fair Value as of December 31,
		2015		2014
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	9,325	$	6,549
Commodity forward contracts	Other liabilities	12,437		3,559
Total liability derivatives		$	21,762	$	10,108

Impact Of Derivative Instruments Designated As Fair Value Hedges

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in Income on Derivative	Year Ended December 31,
		2013
Commodity forward contracts	Cost of sales	$	(303	)

Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in Income on  Hedged Items	Year Ended December 31,
		2013
Firm commitment designated as the hedged item	Cost of sales	$	143

Impact Of Derivative Instruments Not Designated As Fair Value Hedges

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Year Ended December 31,
		2015			2014			2013
Commodity forward contracts	Gross profit	$	(11,395	)	$	(9,678	)	$	5,438

Offsetting of Derivative Assets

	Derivative Assets as of December 31,
	2015		2014
Derivative assets subject to enforceable master netting arrangements	$	—	$	2,333
Derivative assets not subject to enforceable master netting arrangements	462		111
Total derivative assets	$	462	$	2,444

	December 31, 2015							December 31, 2014
Offsetting of Derivative Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	5,091	$	(5,091	)	$	—	$	3,034	$	(701	)	$	2,333

	December 31, 2015						December 31, 2014
Derivative Assets by Counterparty	Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount		Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount
Counterparty A	$	—	$	—	$	—	$	2,333	$	—	$	2,333
Total	$	—	$	—	$	—	$	2,333	$	—	$	2,333

Offsetting of Derivative Liabilities

	Derivative Liabilities as of December 31,
	2015		2014
Derivative liabilities subject to enforceable master netting arrangements	$	5,803	$	1,490
Derivative liabilities not subject to enforceable master netting arrangements	10,868		7,917
Total derivative liabilities	$	16,671	$	9,407

	December 31, 2015							December 31, 2014
Offsetting of Derivative Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	10,894	$	(5,091	)	$	5,803	$	2,191	$	(701	)	$	1,490

	December 31, 2015						December 31, 2014
Derivative Liabilities by Counterparty	Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount		Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount
Counterparty A	$	5,564	$	—	$	5,564	$	1,490	$	—	$	1,490
Counterparty B	239		—		239		—		—		—
Total	$	5,803	$	—	$	5,803	$	1,490	$	—	$	1,490